US national park launches major effort to restore endangered trout species

Rocky Mountain National Park has embarked on a comprehensive restoration programme targeting non-native fish species that have dominated the park's aquatic ecosystems for more than 80 years. The invasive species have significantly altered stream habitats and threatened native species, prompting park authorities to take decisive action.

The restoration effort involves treating 14.3 miles of streams connected to the Grand Ditch using rotenone, a fish eradicant. The chemical treatment is designed to eliminate non-native species while creating conditions suitable for the recovery of the endangered greenback cutthroat trout, a native species facing severe population decline.

The project represents a substantial commitment to ecosystem management, with crews working through 2026 to complete the restoration work across multiple stream sections. Park officials view the initiative as essential to maintaining biodiversity and preserving the ecological integrity of the region's aquatic habitats.

The greenback cutthroat trout, historically native to Colorado's high mountain streams, has experienced dramatic population losses due to competition from introduced species and habitat degradation. Restoration experts believe the removal of invasive fish will provide the native trout species with improved conditions necessary for population recovery and long-term survival.